- Copies data without calling class constructors or property set functions and therefore produces no side effects.
- Enables subclasses to customize the copy behavior
Retrieving/storing the state of a handle
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Hi,
Is it possible to retrieve the old state of a modified handle object? more concretely, suppose a have a class such as
classdef myclass < handle
...
end
and I create an instance of myclass, e.g. h0=myclass(varargin) and create a copy h=h0; I understand that if I modify h0, then h will also be modified. My problem is that I would like to pass h0 through a function that modifies it randomly and I need to repeat the exercise several times and see how the results differ. In order to be able to do that, I need the original state h.
Is there anyway to achieve this?
Thanks,
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Steven Lord
2016년 10월 20일
You could make your class a value class rather than a handle class or you could make your class Copyable. By subclassing matlab.mixin.Copyable the class inherits a copy method that:
When you need to make random changes to the object that won't affect the "main" instance of your object, pass a copy. When you want to have two instances that have normal handle semantics (changing one changes the other) use non-indexed assignment to create the second instance.
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Steven Lord
2016년 10월 20일
Value classes can take up lots of memory. So can handle classes. It all depends on what is stored in their properties and how you use them.
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